[en] Mc Cormick and Jordan's Sexual Irrationality Questionnaire (SIQ), elaborated in 1986, has been adapted to the French language and tested on a sample of 165 subjects.
The organisation of the sexual rationality-irrationality dimension depends on the gender of the subjects. Among female subjects, it appears mostly as a one-factor variable. Its optimal measure is supplied by the SIQ-R-F scale, a reduced version of the SIQ presenting a better internal consistency. Among male subjects, it rather appears structured in several independent factors. Factor analysis thus allows to distinguish four different patterns of sexual irrationality.
Among female subjects, the decisive impact of sexual irrationality lies in an inhibition of sexual interest. Among male subjects, the sexual communication seems to be a vulnerable area of first importance.
The external validity test of the SIQ is not very probant. This surely underlines a probable problem in the choice of the criteria as well as the compexity of the relationship between irrational cognitions and clinical data.